Machine for forming concrete building-blocks.



No. 772,563. Y I PATBNTED 001?. 13., 1 904.

I R. T.- FROST. MACHINE FOR FORMING CONCRETE BUILDING BLOCKS.

' APPLICATION FILED JAN. 26, I904.

N0 MODEL.

v WITNESSES: j /NVENTO/? I 'lRabe'rf CZ". Fras-t,

UNITED STATES Patented October 18, 1904.

PATENT OFFICE.

ROBERT T. FROST, OF DOWS, IOWA, ASSIGNOR TO THE FROST CONCRETE I STONECOMPANY, OF DOWS, IOWA.

MACHINE FOR FORMING CONCRETE BUILDING-BLOCKS.

SPECIFICATION forming part of Letters Patent No. 772,563, dated October18, 1904.

Application filed January 26, 1904. Serial'N'o. 190,659. (No model.)

To all whom it may concern.-

strength in construction.

Be it known that I, ROBERT T. FRos'r, a citizen of the United States ofAmerica, and a resident of Dows, Wright county, Iowa, have inventedcertain new and useful Improve ments in Machines for Forming ConcreteBuilding-Blocks, of which the following is a specification.

My invention relates to improvements in machines for forming concretebuildingblocks; and the object of my invention is to provide a machinewhich is very simple in construction and supplied with means whereby achange in the form of the mold may be easily effected. 7 These objects Ihave accomplished by the mechanism which is hereinafter described andclaimed and which is illustrated by the drawings hereto annexed, inwhich Figure 1 is a plan View of the machine, showing the mold adjustedto form a cornerblock. f Fig. Qis a plan view showing a variation in the'formof the mold for another style of block, and Fig. 3 is also a planview showing the mold arranged for a third pattern of block. 1

Similar letters refer to similar parts throughout the several views.

I have in this machine emphasized the'idea of simplicity in design withcheapness and This is shown by the fe'wness of the parts, and the mannerof their location and connection renders the parts of the mold readilyadjustable for the purpose of forming different patterns of building'-blocks.

The bed-plate 0, which is shown in plan in all three views, has acentrally-located vertical upright a, which is utilized as a pivot forthe inner interchangeable horizontallymovable sections of the mold b, c,e, j, and w. But two of these inner sections can be used at any one timeto form the inner portion of the mold. Drop side sections f, a, and darehinged to sides of the bed-plate 0 by means of the hinges 7c and l, oand y, and m and a,

respectively. These drop sides form the outer portions of the mold,respectively, according to the particular arrangement of the innersections. The drop sides may be fastened together at the cornerswhen'raised into position by means of lock-nuts p, g, and it. As shown,these lock-nuts work upon threads on theend of bolts which are pivotedat their other ends to studs afliXed to the drop sides, as shown.

The inner'section f has two parts pivoted at z and may be movedhorizontally when the side f has been dropped. The manner of releasingthe sections of the mold from the block is shown in all three figuresbythe dotted lines. In addition I have shown in Fig. 1 a method ofmolding blocks of a different configuration by means of placingsectional pieces across the interior of the closedup mold. The onlyoperation necessary in order to change the form of the mold is to removeone or more of the inner sections and replace'them by others of thedesired shape, the upright pivot at keeping them in the proper relationto each other.

Other shapes of the sectional parts of the mold than those shown may besubstituted without altering the essential idea of my invention.

What I claim as new, and desire to secure by Letters Patent, is

1. A machine for forming concrete building-blocks, consisting of acombination of acl- .justable sectional mold-plates, centrally pivotedto a bed-plate, and drop sides hinged to the edges of said. bed-plate,substantially as shown and described.

2. A machine for forming concrete building-blocks, having an adjustablemold con sisting of outer drop sides and two removable, exchangeableinner sides, said inner sides pivoted on a bolt connected to the centerof a bedplate, and a bed-plate, substantially as shown and described.

' 3. A machine for forming concrete building-blocks, consisting of abed-plate, outer drop sides pivoted to said bed plate, two Signed atDows, Iowa, this 18th day of Janremovable exchangeable innerhorizontallynary, 190i. movable sides pivoted to a bolt centrallyconnected to said bed-plate, and a pivot-bolt centrally connected tosaid bed-plate, said outer Witnesses: drop sides furnished withfastening means, LoUIs L. BERNUAUER, substantially as shown anddescribed. W. BARBER.

ROBERT 'l. FROST.

